语法：

Trigger on an INSERT, UPDATE, or DELETE statement to a table or view (DML Trigger)
CREATE TRIGGER [ schema_name . ]trigger_name
ON { table / view }
[ WITH <dml_trigger_option> [ ,...n ] ]
{ FOR / AFTER / INSTEAD OF }
{ [ INSERT ] [ , ] [ UPDATE ] [ , ] [ DELETE ] }
[ WITH APPEND ]
[ NOT FOR REPLICATION ]
AS { sql_statement [ ; ] [ ,...n ] / EXTERNAL NAME <method specifier [ ; ] > }
<dml_trigger_option> ::=
[ ENCRYPTION ]
[
EXECUTE AS Clause ]
<method_specifier> ::=
assembly_name.class_name.method_n..